DG508 Ignition Coil & SP479 Double Iridium Spark Plug Kit - Reliable

In this review of the DG508 Ignition Coil & SP479 Double Iridium Spark Plug kit, the bottom line is simple: this pack is for owners of older Ford trucks and vans who need a direct-fit ignition upgrade that balances longevity and cost. The kit includes eight ignition coil packs and eight double iridium spark plugs, and its single biggest selling point is compatibility across a wide range of Ford 4.6L, 5.4L and 6.8L engines from the late 1990s through 2012, making it a practical one-stop replacement for multi-cylinder maintenance. Installation is straightforward for a DIYer and the parts match OE designs for a mostly trouble-free swap.

Key Features

• Wide vehicle coverage: Fits many Ford models including F-150, E-Series, Expedition and Mustang across 1997-2012, reducing the need to source individual parts.
• Complete 8-cylinder kit: Includes eight ignition coil packs and eight double iridium spark plugs so an entire bank or full engine can be serviced at once.
• Double iridium spark plugs: Designed for extended life and consistent spark performance to help with cold starts and steady combustion over long service intervals.
• OE-matching ignition coils: Coils are built to match or improve on original equipment fit and connection, with thermoplastic connectors and internal ferrite noise suppression for reliable operation.
• Improved fuel economy potential: Replacing worn coils and plugs often reduces misfires and can restore fuel efficiency and engine smoothness.

Who It's For

This kit is best for DIY mechanics, fleet owners, and anyone maintaining Ford V8 and V10 engines who need a full set of coils and plugs that directly replace common OE numbers like DG508 and FD503. It suits people working on F-150, F-250, F-350, E-150, E-250, E-350, Expedition, Mustang and similar models within the listed years.

It is less suitable for drivers who only need a single coil or a single plug replacement, or for owners of later-model vehicles outside the stated 1997-2012 compatibility. Buyers who require OEM-branded packaging or included installation manuals should note that a manual is not provided in the package.

Pros & Cons

Pros

• Direct-fit replacement across many Ford engines simplifies a full-engine service.
• Double iridium plugs offer long life and consistent ignition performance.
• Customers report improved fuel economy and quick installation, indicating good build quality and fit.

Cons

• Spark plug durability received mixed feedback from some users, so longevity may vary by use and conditions.
• Package does not include an instruction manual, which may challenge less experienced installers.

Specifications

Our Verdict

The DG508 + SP479 kit is a sensible value for owners who need a full ignition coil and spark plug replacement for older Ford V8/V10 engines. It offers OE-matching coils and long-life iridium plugs that can restore smooth idle and improve fuel efficiency, making it a practical, cost-effective choice for DIY maintenance or fleet servicing, provided buyers accept that plug longevity may vary and no manual is included.

Frequently Asked Questions

Does this kit fit my Ford F-150?
It fits many F-150 model years with 4.6L and 5.4L engines within the 1997-2012 range; check vehicle fit in the product images and part numbers.

Are the spark plugs long lasting?
The plugs are double iridium and designed for extended life, though some users report mixed longevity depending on driving and conditions.

Is installation difficult?
Most users find installation straightforward and report quick swap times, but an instruction manual is not included so basic mechanical experience is helpful.